Unlimited mailboxes. Automatic warmup.
Connect Gmail, Outlook, or any IMAP/SMTP provider. Warmup runs automatically in the background with configurable volume targets and reply rates. DNS health checks validate your SPF, DKIM, and DMARC setup.
Lambda Group
Mailboxes
Email | Status | Sent / Limit | Tags | Warmup Stats | Warmup | Sending | |
|---|---|---|---|---|---|---|---|
Alex Johnson | Active | 14/50 | Cold Outreach | Day 2122/2591% health | |||
Sarah Mitchell | Active | 31/50 | Cold Outreach | Day 1819/2587% health | |||
Outreach Pool | Active | 5/25 | Warming Pool | Day 78/2574% health | |||
Alex (Domain B) | Active | 28/50 | Cold Outreach | Day 1617/2583% health | |||
Sales Team | Active | 42/50 | Agency | Day 2424/2594% health | |||
Jenny Lee | Active | 19/50 | Cold Outreach | Day 1213/2579% health | |||
Tom Rivera | Active | 37/50 | Agency | Day 2021/2588% health | |||
Priya Sharma | Active | 8/25 | Warming Pool | Day 56/2568% health |
Connect once, send forever
Connect as many mailboxes as you want. Gmail OAuth, Outlook OAuth, or custom IMAP/SMTP. No per-seat charges.
Background workers run continuously with configurable starting volume, daily increase, target, and reply rate targets.
Validates SPF, DKIM, and DMARC records for every connected mailbox. Catch configuration issues before they affect sending.
Every mailbox shows its current status: active, inactive, error, warming_up, suspended, or failed. You always know where things stand.
Add mailboxes in under a minute
Add Gmail or Outlook via OAuth, or connect any provider with IMAP/SMTP credentials. No app password headaches for Google and Microsoft.
Background workers run every 5 to 30 seconds. Configure your starting volume, daily increase, target volume, and reply rate targets. Warmup just happens.
Pick mailboxes for each campaign. Choose rotation mode: round-robin, random, or priority. SendKit respects per-account daily limits and matches ESPs when possible.
Connect as many mailboxes as you need across multiple domains. Sender rotation keeps volume distributed so no single account gets overloaded.
Set your starting volume, daily increase, and target. Warmup workers handle everything in the background while you focus on building campaigns.
Mix Gmail and Outlook accounts in the same campaign. ESP matching routes Gmail leads through Gmail senders and Outlook leads through Outlook senders.
Dedicated IPs per mailbox, always
Warmup that runs itself. DNS checks that catch misconfigurations.
Warmup isn't a toggle you flip and hope for the best. SendKit's background workers run every 5 to 30 seconds with configurable volume targets and reply rates. DNS validation checks your SPF, DKIM, and DMARC records so you catch setup issues before they hurt deliverability.
Configurable warmup with real controls
Set your starting volume, daily increase amount, target volume, and reply rate targets. Background workers handle the rest, running every 5 to 30 seconds. Warmup activity varies naturally so it doesn't look like a bot to email providers.
Sender rotation with three modes
Assign multiple mailboxes to a campaign and pick your rotation strategy: round-robin distributes evenly, random adds unpredictability, priority lets you favor certain senders. ESP matching routes through the right provider when possible.
Got questions? We've got answers.
Unlimited. There's no cap on connected mailboxes regardless of your plan. Connect 5 or 500.
Ready to hit primary?
Set up SendKit's isolated infrastructure and start sending in under 15 minutes.
Dedicated IPs on every plan. Cancel anytime.